Video: Dab tsi yog RNA polymerase txav raws DNA?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
RNA polymerase synthesizes ib RNA transcript complementary rau lub DNA template strand hauv 5' rau 3' kev taw qhia . Nws txav pem hauv ntej nrog template strand nyob rau hauv lub 3' mus rau 5' kev taw qhia , qhib lub DNA ob helix li nws mus.
Ntxiv mus, koj nyeem DNA nyob rau hauv txoj kev twg?
Thaum transcription, RNA polymerase nyeem tus qauv DNA 3' → 5' kev taw qhia , tab sis mRNA yog tsim nyob rau hauv lub 5' rau 3' kev taw qhia . mRNA yog ib leeg-stranded thiab yog li ntawd tsuas muaj peb ua tau nyeem ntawv thav duab, ntawm uas tsuas yog ib qho yog txhais.
Ib yam li ntawd, ua li cas RNA polymerase unwind DNA? Cov enzyme RNA polymerase khi rau lub template strand ntawm DNA thaum pib ntawm qhov sib lawv liag kom tau theej. RNA polymerase tshem tawm / "unzips" cov DNA los ntawm kev rhuav tshem cov hydrogen bonds ntawm cov nucleotides ntxiv. RNA nucleotides yog ua ke nrog kev sib ntxiv DNA hauv paus.
Tsis tas li ntawd, qhov kev taw qhia twg yog RNA tsim?
Transcription ntawm ob lub noob. (a) RNA polymerase txav los ntawm 3' kawg ntawm lub template strand, tsim ib RNA strand uas loj hlob hauv 5' → 3' kev taw qhia (vim nws yuav tsum yog antiparallel rau lub template strand).
DNA hloov pauv li cas?
kev sau ntawv / DNA transcription . Kev sau ntawv yog tus txheej txheem uas cov ntaub ntawv nyob rau hauv ib tug strand ntawm DNA yog theej rau hauv ib lub molecule tshiab ntawm tus tub txib RNA (mRNA). Cov tshiab tsim mRNA cov ntawv luam ntawm cov noob ces ua daim ntawv qhia txog cov protein synthesis thaum lub sijhawm kev txhais lus.
Pom zoo:
Lub luag haujlwm ntawm DNA polymerase hauv DNA replication Brainly yog dab tsi?
Kev piav qhia: DNA polymerase yog ib qho enzyme uas muaj ntau yam DNA polymerases. Cov no koom nrog hauv DNA replication, proofreading thiab kho DNA. Thaum lub sij hawm tus txheej txheem ntawm replication, DNA polymerase ntxiv nucleotides ntawm RNA primer
Dab tsi yog cov ntaub ntawv DNA polymerase xav tau?
Txhawm rau pib cov tshuaj tiv thaiv no, DNA polymerases xav tau ib qho primer nrog dawb 3'-hydroxyl pab pawg uas twb tau ua khub rau tus qauv. Lawv tsis tuaj yeem pib los ntawm kos los ntawm kev ntxiv nucleotides mus rau ib qho dawb-stranded DNA qauv. RNA polymerase, sib piv, tuaj yeem pib RNA synthesis yam tsis muaj primer (Tshooj 28.1. 4)
Dab tsi yog DNA polymerase kuaj xyuas kev hloov pauv?
Thaum lub sij hawm DNA synthesis, thaum ib qho tsis raug nucleotide tau tso rau hauv cov ntxhais ntawm DNA, DNA polymerase rov qab los ntawm ib khub nucleotide, excises lub mismatched nucleotide thiab kho qhov yuam kev. Yog li, DNA polymerase kuaj xyuas kev hloov pauv thaum lub sijhawm DNA rov ua dua
Dab tsi yog cov haujlwm ntawm DNA polymerase 1/2 thiab 3?
Point of Difference DNA Polymerase I DNA Polymerase III Hom strand synthesized Lagging strand Leading thiab lagging strands Lub luag hauj lwm hauv DNA kho Active Tsis muaj lub luag haujlwm Biological functions nyob rau hauv lub cell DNA replication, Processing ntawm Okazaki fragments, maturation Excision kho DNA replication, kho DNA
Lub hom phiaj ntawm DNA polymerase 1 yog dab tsi?
DNA polymerase I (los yog Pol I) yog ib qho enzyme uas koom nrog cov txheej txheem ntawm prokaryotic DNA replication. Lub physiological muaj nuj nqi ntawm Pol I yog tsuas yog los kho tej yam kev puas tsuaj nrog DNA, tab sis nws kuj pab mus txuas Okazaki fragments los ntawm rho RNA primers thiab hloov cov strand nrog DNA